The court heard how the financial adviser flirted with and kissed the woman while out celebrating a friend's birthday at The Roof Gardens in Kensington, west London, on August 2 last year.

He was traced two weeks later when she found his Facebook page, the jury was told.

The woman claimed he bought her a spiked vodka Red Bull drink, but Mr Riches insisted he was not a "sleazebag" and was "being dragged through the mud and made to look like some sort of horrible predator".

Blood tests found the complainant's alcohol levels were relatively low, but that she did have MDMA in her system.